| Grenzach-Wyhlen to Opwijk | 283.20 mi (455.76 km) |
| Grenzach-Wyhlen to Ostend | 331.35 mi (533.25 km) |
| Grenzach-Wyhlen to Oud-Heverlee | 263.89 mi (424.70 km) |
| Grenzach-Wyhlen to Oud-Turnhout | 286.53 mi (461.13 km) |
| Grenzach-Wyhlen to Oudenaarde | 292.34 mi (470.48 km) |
| Grenzach-Wyhlen to Oudenburg | 326.83 mi (525.98 km) |
| Grenzach-Wyhlen to Oupeye | 236.36 mi (380.38 km) |
| Grenzach-Wyhlen to Overijse | 264.14 mi (425.09 km) |
| Grenzach-Wyhlen to Overpelt | 272.54 mi (438.61 km) |
| Grenzach-Wyhlen to Paal | 265.70 mi (427.60 km) |
| Grenzach-Wyhlen to Peer | 266.58 mi (429.01 km) |
| Grenzach-Wyhlen to Pepinster | 224.38 mi (361.10 km) |
| Grenzach-Wyhlen to Peruwelz | 275.70 mi (443.70 km) |
| Grenzach-Wyhlen to Perwez | 248.20 mi (399.45 km) |
| Grenzach-Wyhlen to Philippeville | 231.14 mi (371.98 km) |
